Safety-valve for steam-boilers.



- No. 800,340. r PATENTBDSEPT.26,1905.

- W. F. THORN.

SAFETY VALVE FOR STEAM BOILERS.

APPLICATION FILED MAY 8, 1905.

iwenl'oz Witnwom y UNITED STATES PATENT OFFICE.

WILLIAM F. THORN, OF LOTH-ROP, MONTANA.

SAFETY-VALVE FOR STEAM BOlLERSr Specification of Letters Patent.

' Patented Sept. 26, 1905.

Application filed May 6,1905. Serial No. 259,091.

To all whom it mayooncern: 'Be it known that 1, WILLIAM F. THORN, a

citizen of the United States, residing at Lothrop, in the county ofMissoula and Stateof Montana, have invented certain new and usefulImprovements in Safety-Valves for Steam- Boilers, of which the followingis a specificathe boiler from injury by being burned or blistered.

Other objects and advantages of the invention will hereinafter appear,and the novel features thereof will be specifically definedby theappended claims. The invention is clearly illustrated in theaccompanying drawings, which, with the numerals of reference markedthereon, form a part of this specification, and in which Figure 1 is avertical cross-section through a horizontal boiler with my improvementsapplied. Fig. 2 is a side elevation with a portion broken away andparts'in section.

Like numerals of'reference indicate like. parts throughout both views.

Referring now to the details of the drawings, 1 designates a tubularboiler of the horizontal type, and 2 the flues thereof.

3 is the blow-ofi' pipe, and 4 a valve-seat which may be milled into theboiler-plate 5. 6 is a valvefitted to said seat, and this valve iscarried by the valve-stem 7 which is guided in its movements by asuitable guide 8, the endsof which are oppositely curved, as shown, andengage or embrace theadjacent flues, 'as seen clearly in Fig. l. I

9 is a valve-wheel carried by the stem 10,

which latter has a ball-and-socket connection 11 with the upper end ofthe valve-stem 7, as seen clearly in Fig. 1, although this form ofconnection may not always be employed. When employed, thisball-and-socket connection is detachably united by means of theremovable coupling portion 12, as shown.

The valve-stem 10 extends through a stuffing box and gland 13 at the topof the boiler,

as shown, and. a suitable brace 14 is employed, secured to theboiler-plate and having an opening through which the stem 10 passes, as

shown Theoperation will be apparent. Should the blow-off pipe or thevalve in the blow-off pipe break or become inoperative, the closing ofthevalve- 6 Will retain the Water in the boiler and prevent injury tothe latter, as will be readily understoo Modifications in the details,proportions of parts, &c., may be resorted to Without departing from thespirit of the-invention or sacrificing any of its advantages.

What is claimed as new is 1. A safety attachment for steam-boilers,

comprising a valve controlling the blow-off and operable in case theblow-off pipe or its valve becomes inoperative and a guide for the stemof said valve disposed between the flues ofthe boiler.

2. :A safety-valve attachment for steamboilers, comprising avalvemounted to control the blow-o-fl pipe and a stem for actuating saidvalve, and a guide for said stem,'supported on thefiues of the boiler.

3. A safety-valve attachment for steamboilers, comprising a valvemounted to control the blow-01f pipe, a stem for actuating said valve, aguide for said stem, and an operating-wheel'having a ball-and-socketconnection with the valve-stem said guide being disposed between thevalve'and said ball-andsocket joint.

4. In a safety-valve-attachment forsteamboilers, avalve fitted to aseatlover the blowoif pipe, a stem for said valve, a guide forsaid stemsupported on the flues of the boiler, a

brace on the top'of the boiler, a valve-wheel,

its-stem mounted in saidbrace, a stuffing-box through which the latterstem passes, and a detachable connection between the said stems.

In witness whereof I have hereunto setmy hand, in the presence of twowitnesses.

W ILLIAM F. THORN.

Witnesses:

. R. J. BROWN,

W. I. WRIGHT.

IOO

